Machine for grinding bits



Jan. 30, 1923.

W. L. SCHELLENBACH ET AL. MACH! NE FOR GRI NDING B TS 8 SHEETSSHEET 1 Fl LED JULY 27, I920.

INVENTOR8 mam;

Bxfazarence 611030714 ATTORNEYS.

Jan. 30, 1923. 1,443,384- W. L. SCHELLENBACH ET AL.

MACHINE FOR-GRINDING BlTs FILED JULY 27, 1920. 8 SHEETS'SHEET 2 IN V EN TOR.

muwmgia Llen Mo/y e abawow B A TTORNEYS.

Jan. 30, 1923.

w. L. SCHELLENBACH ET AL. MACHINE FOR GRINDING 811's 8 SHEETS-SHEET 3 FILED JULY 27, 1920.

INVENTOR6/ mzmflfi c lyz mh 1, 4;! rence 677/8071! a ATTORNEYS.

Jan. 30, 1923.

, 8 SHEETS'SHEET 4 W. L. SCHELLENBACH ET AL MACHINE FOR GR I NDI NS 8 rs F I LED JULY 27 1 920 whoa wags I Jan. '30, 1923. 1,443,384

' W. L SCHELLENBACH ET AL.

MACHINE FOR GRINDING BITS.

FILED JULY 27. 1920. 8 SHEETSSHEET 5 V awuembm 8 SHEETS'SHEET 6 F l LED JULY 27 W. L SCHELLENBACH ET AL. MACHINE FOR GR ND NG Bl TS Jan. 3@, 1923.,

Jan. 30, 1923.

W L. SCHELLENBACH ET AL MACHINE FOR GRINDING Brrs FILED JULY 27, 1920.

8 SHEETS'SHEET 7 m. mx @w mm w .m

IV z 1 alt/W 8 SHEEYSSHEET 8 Jan. 30, 1923.

W. L. SCHELLENBACH ET AL MACHINE FOR GRINDING Bl TS.

FILED JULY 27. 1920.

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' Wen am Z/ZZZZZZWZZ fi/MZZWZZaJ, Uiaravca (25052220020, 75 y {5% 0 5w abbot/1 4 Patented Jan. 30, 1923.

UNITED STATES WILLIAM L. SCHELLENBACH, OF CINCINNATI, AND CLARENCE J. ROBINSON, 'OF WILMINGTON, OHIO, ASSIGNORS TO THE IRWIN AUGER IBII COMPANY, OF WILMINGTON, OHIO, A CORPORATION OF OHIO. i

. MACHINE FOB, GRINDING BITS.

Application filed July 27,

To all whom it may concern:

Be it known tliatwe, l/VILLIAM L. Scam.- LENBAGH' and CLARENCE J. Itonmsox, citi-- Zens of the United States, residing, respectively, at Cincinnati, Hamilton County, Ohio, and Wilmington, in the county of Clintonand State of Ohio, have invented certain new and useful Improvements in Machines for Grinding Bits, of .wliichthe followingis a specification, reference being had therein to the accompanying drawing.

This invention relates to machines for grinding bits and in particular relates to an improvement upon machines for simultaneously grinding the shanks and the grooves. In this type of machine a piece of work is rotated between a headstock and a tailstock which are carried on a carriage having a longitudinal movement on the bed of the machine. This movement is secured. by the rotation of the driving element in the Y headstock, through a screw on the latter and a nut on the bed of the machine. On the sliding carriage is also located a grinding wheel having a transverse movement on the same :this wheel operates on the shanks only of the bit being formed, and is therefgre, e-

called the shank grinding wheel. cured to the frame, and therefore with a relative movement to the piece of work, is a second grinding wheel, properly profiled to cut the grooves of the bit, called for that reason the groove grinding wheel. These two wheels, the work, and the various other members are actuated or manipulated in the manner described hereafter.

The fundamental operation of such a machine isas' follows: The motors being started, apiece of work is placed between the headstock andthe tailstock. At the proper time, the work is started rotating and advancing across the face of the groove grindingwheel by rotation of the worm, which has the'samepitch as the bit to be produced. Simultaneously the two grinding wheels are moved towards each other, and into contact with the work. Under their action the bit is reduced to shape: at the end of the travel of the; work, it is automatically reversed both in longitudinal androtational direction. i

Our inventionhas more particularly for object the starting and stopping of the bit Inovingmechanism, and the simultaneous 1920. Serial No. 399,270.

engagement or disengagement of the groove and shank grinding wheels, by the movement of a single handle. This leaves the operator free with his otherhandto manipulate other parts of the the work.

Referring to the drawings, Fig. l is a machine or to adjust side elevation of a complete machine embodying our invention;

Fig. 2 is a detail of the operating mechanism;

Fig. 3 is an end elevation of the operating mechanism;

Fig. 4 is an end elevation of the whole machine, 'to show the relative arrangement of the parts, seen from the tail stock end;

Fig. 5 is a similar View from the head-' stock end;

Fig. 6 1s a plan of themachine;

connections, I

lug. Sis a detailed view, partly in section, ot the driving head, with clutch elements The machine is driven from an electric Figxi is a rear view showing the driving motor M on the shaft of which is a belt 'i pulley M and alsofrom a second electric motor N on the shaft of whichis a wheel gear driving the worm D. On the shaft of.

this-worm is a belt pulley 96 These pulleysrespectively drive the shank grinding wheel pulley 64 and the pulley 87 for the carnage advancing mechanism by means of belt transmission to a small pump 7 6, which serves to deliver lubricant or cooling liquid to the grinding wheels or elsewhere as desired. Inasmuch as these elements maybe I driven many other manner wlthout affect-- ing the essence of our present invention,

they have been described broadly in such a manner as to show an operative relation.

It will be noted that there is no positive transmission ratio between the motors and any of the elements driven thereby; the

speed of the wheelsis therefore, because of s 1 bevel gears42 and 88 are mounted on the the belt slip, in no fixed ratio; to the speed of the work or to each other.

The groove grinding wheel 103 is keyed on the shaft onwhich is secured the driving pulley 75 this shaft is carried on a carriage 1 given a partial rotation in these brackets,

being actuated-by-the lever but has no longitudinal movement. 103 is the groove grin'dingwheel, and 104 is the shank grinding wheel, operating: on opposite sides of the bit stock or work piece105 carried therebetween by ata-i-l stock 106: and a head stock 107. A carriage 108 has a longitudinal m0- tion onthe bed 1: thehead stock, tail stock, the bar of stock between them, and the-shank grinding wheel are all mounted on this carriagelOS and travel with it. The-shank grinding wheel is thuscaused to operate at thesameportion of .the piece of stock, whatever be the position of the carriage. The head stock 107iscomposed .(F'gsmfiand 8) of a standard or bracket 81, with a driving shaft 79 mounted therein. are secured-two collars 80, one on either side of the standard v81, in such manner that any longitudinal movement of the shaft 79 118 immediatelycommunicated to the headstock 107 and thus to the. carriage, which is reciprocated from rightto left, or vice versa, with the tail stock, work, and shank grinding. wheel mounted thereon. As shown in Fig. 8, theshaft 79 has at its outer end a. worm 84 fitting in anut36 secured to the bed '1. Arsleeve 44 surrounding this shaft 79 is keyed to it, and isheldagainst longitudinal movement by suitable collars 7 9w: its ends; from this it will be seen that sleeve 44 does not partake in any longitudinal movementof the shaft 79. Mounted on this sleeve 44 and keyed thereto in such manner as to have a slight longitudinal movement relative thereto,is a-sleeve 44 having clutch teeth 44 ateither end. Two furthersleeves 42 and 88are disposed aboutthe shaft 79, and are loose thereon. clutch teeth 42 and 88* adapted to engage the clutch teeth 44 alternately. Reversed sleeves 42 and 88, and keyed thereto. A single bevel gear 41- mounted-von shaft 40 drives both bevelgears 42 and .88 butin opposite directions,.as will be evident from the drawings. Shaft 79 and shaft 40. are both securely held in journal bearings ina rigid member 1- secured to the bed 1 of the i machine. The driving pulley 87 for the- On this shaft 7 9'- These sleeves have work: piece 105; actuates a worm 37 meshing with a gear 39" carrying the bevel gear 41. As the pulley 87 rotates, it drives this bevel gea-r41, and thus the bevel gears 42*. and 88, which, rotate in opposite directions. Accordingly as theclutch teeth 42? and 44 or the clutch teeth 88 and 44 are thrown into engagement, the sleeve 44, and with it the sleeve 44 keyed thereto, will be rotated in one 'orthe.otherdirection. The latter sleeve drives the shaft 79 and the worm 84, to rotate the work before the grinding wheels. Asthe worm turns, it advances in the nut 36, and causes the carriage with its attached.

members, tomove along the machine. and

across the groove grinding wheel. It is thus apparent that the movement 1 of the work i to right or left is dependent on whether the clutch element is throwni in to the-right or to the left. For this purpose aishaft 204iis disposed ina convenient part ofthe bed or other stationary portion of the machine, with a clutch yoke 207 having shoes 89.. A full-stroke mechanism comprising plunger 59, spring 60,- and-acam- 61 keyed thereto, turns with theshaft, and serves to assure the clutch sleeve being. engaged either to right or left without stickingin a central or neutral position when actuated through this mechanism. The rod 27 across the front of themachine is attached to. shaft 204, and serves to rock it to right or left as.

required 'atthe right end :ofthis rod 27 are secured two dogs- 56 and adjustable along it, outside the supporting-bracket 54. Depending from the rear end of theatail stock is an arm 26 which .hasaneye at its .lowerv This consists of a shaft 2l0 mounted ,iirthestandard 1, and having apartial rotational. movement; On thisshaft 210is a-sleeve=215g with aishoe 216Mc0operating with integral.

rings209 formed on the cylindrical. surface of the sleeve 44; ailongitudinal movement of thesleeve 215 on .the shaft210ywill shift.

the'clutch to right or left. Thissleevei2lfi has a triangular aperture cutiinv its wall at 214. forming two camg surfaces to cooperate with a pin 2-11 in shaft210; It is apparent that as the-sleeven21'5 is in.- the right or left position, a.rotation of shaft 210'. will; cause the pin 211 to strike one of these cams and move the sl-eeve 21 5, and withwit the clutch member 44, to the right or left; the. full-stroke mechanism assuresthe c0mit for a part revolution.

. pletion of the movement when theshaft 210 210 is actuated as follows:

,Journalled in the brackets 101 and. 102 of the bed l'of the machine is a shaft 3 extending substantially the length of the machine, and secured against longitudinal mo-vementby suitablecollars. Onthis shaft is mounted a'handle 2, aforesaid, to rotate At the left end, and opposite the shaft 210, alcrankarm 111 is keyed to this shaft 3. A similar crank arm 25 on theshaft 210 is connected to the crank'lll by a simplelink motion 112. As the handle 2 is thrown up: or down, the clutch sleeve 44 is engaged to right or left; or by keeping the handlein the out position, the clutch is'kept in neutral position.

The shank grinding wheel 104and the groove grinding wheel 103 are mounted respectively on the carriages 107 and 110; carriage 107 being carried on the carriage 108, andpcarriage. 110 being on the bed 1 of the machine; this disposition enables the two grinding WhGGlS'tQ'bG moved towards or away from the work. As shown in Figs. 1, 2 and 3, the carriage 107 movesina dove-tail 10, and has a pin- 9 embraced by jaws 5 of an arm 109 keyed to the shaft 3 the arm 109 thus forming a rock arm. A second arm 6 depends from and is keyed to this shaft 3, and. is connected at? to a transversev link member 8 which serves tooperate thegroove grinding wheel 103. Therefore, as the handle 2 is thrown up or down, the grinding wheels are brought into or out of contact with the work. As the and also to throw into or out of engagement the shank grinding wheel and the groove grinding wheel with the work, thus freeing him to that extent for other duties in con- 7 nection with the machine.

Having thus fully described our invention, what we claim as new and desire to secure by Letters Patent, is

1. In a machine for forming bits, a bed,

dise

ciprocating means into operative engage ment and to adjust the relative position ricetweensaid shank wheel and crimp wheel.

' 2. Thevcombination, with a bed, a shaft,

brackets to support said shaft, a lever. on

said shaft fixed thereto, axcarriage on said grinding wheel, a shank grinding wheel on said carriage, andv means upon saidvshaft for adjusting the position of said groove grinding wheel relative to the shankgrinding wheel, whereby the positions of the said shank and said groove grinding wheels-are determined with regard to. each other by the movement of saidlever.

3. The combination, with a bed, a shaft, brackets to support said shaft, a lever'on said shaft, a carriage on said bed, means on said carriage adapted to move the same latbed, means on said carriage adapted to move the same, longitudinally, a groove erally thereon, a crimp'wheehashank wheel, I

means on the, shaft for effecting relative movements of said crimp wheels and shank wheel toward and away from eachflother, the latter being mounted upon saidcarriage, alever on the other end of said shaft, a link connected thereto at one endand at its other end to a second lever, starting and stopping and the shank grinding wheelthrown into and out of operative engagement. T i

4. The combinatiom'witha bed, a shaft,

brackets to support said shaft, alever on U said shaft, a carriage on said bed, means on said carriage and adapted to move the lever, when said first-mentioned lever is actuated the mechanism will be started or stopped and the grooved grinding wheel and the shank grinding wheelthrowninto and out of operative engagement. v

5. In a machine ofthe class described a shaft, a bracket in which one end of said shaft is journalled, a second bracket in ,spaced relation to the first and having the shaft journalled therein, alever thereon, a depending arm fixed thereon adjacent one nected to said arm at one end and at its vertically extending arm splined on said ping mechanism connected to said second of said brackets, a transverse member conother to a crimp wheel, a crimp wheel,'a

shaft, a pair of jaws on'the outer end of p said member embracing a, pin on a carriage, a second lever at the'other end of said shaft,

a link connected thereto, a third lever,

rneans-*attached' to 'the third lever-t start v and stop the reciprocation of said carriage, a shank wheel =Inounted"on said carriage adapted to reciprocate with it, whereby.

when the first'-1nentionedlever is actuated the reciprocation may be "startedaorastopped and r the 1 grooved grinding --;wheel and" the taneously npon the w0rk, a.bed, of a carriage permitting transverse adj iistinent of said shank grinding wheel on said 'bed, .of mechanism for rotating and "advancing,- a headstock with said earriagey'andl of ='Ineans for -moving said wheel, "carriage and headstock and simultaneously Varying said' sotating and adwancing mechanism;

7. In a machine for grinding 'bits, the combination of a shank grindingwheel and a :grooveagrinding Wheel to operate siIn-n'ltane'onsly upon the work, a-shaft,-an up standing arm on said shaft connected to said shank grinding wheel, a -'"depending arm on said shaft connected to said groove grinding -wheel, wwhereby the actuationnf said shaft simultaneously actuates both grinding wheels to bring them into'or out whee1',-a==shaft,=:ia "lever. on' said "shaft, an up stanthng arni: oirsa'id shaft, means connectmg said upstanding arm; -and @said shank grinding heel, asdependingarm Ion said 'shactt, means connecting said depe'ndingarm and said groove grinding wh'eehwnieans for rocksa'idl' shaft, and. means. to connect said shaft and "said grinding: wheels, whereby said WhQElS" are" simultaneouslymoved into and out of engagement with the work.

I 10." linfla machine. for forming bits, a transversely moyabletshank grinding Wheel, awtriansversely movable. :groove =-grinding wheel, "a headstock, a tailstock, a longitudinally. movable 'carriage carrying' said shank grinding wheel, saidx headstock and saidtaiistock; means for reciprocating" said longitudinal movable carriage, means for moving" said grinding wheels towards and from "the a work including a "shaft, and means for disengaging sa'id rotating and said reciprocating means, saidshaft rheing connected 1 to said- 'moying and i'said disenga ging'-means.. y i In testimony whereofyweaffix our 'sig natures. .c

- VVILLIAQ I. L.-'SGHELLE=NBAGH.

CLARENCE J; ROBINS'GN. 

